Funny, I hit this same thing today, upgrading an old 8.1.7 db to 10.1.
The ixora scripts weren't hard-coded, they were based off of

sys.v_$fixed_table and sys.v_$fixed_view_definition.

There was a spool file for that ... but that server has long since been
retired.
Guess I could point it back at a sterile 8.1.7 db, see what it creates and
drop those objects.
One of those views - X_$CLASS_STAT is throwing ora-600 [16206] and I'm not
too fond of those.